From the Slumberjack Backpacking line of sleeping bags, the Ultimate 30 features a proprietary G3 Fiber insulation that stuffs down compactly while offering a superior warmth-to-weight ratio. Slumberjack Backpacking mummy bags are shaped to eliminate extra bulk, however still offer enough room to spread out a little.G3 Fiber insulation.Nylon diamond ripstop shell.Polyester taffeta lining.Two-layer offset construction and differential cut presents cold spots.Flip Over Hood allows user to flip hood inside out for the option of a flat hood or contoured hood.Draft collar prevents heat loss from neck and shoulder area.Anti-snag zipper protection.Draft tube along zipper keeps out cold air and prevents heat loss along the zipper.Trapezoidal foot box provides space so feet remain in a natural position for more comfort.Vented foot box (patent pending) zips open for more comfort in warmer conditions.Compression stuff sack included.